Theoretical analysis of volume moire tomography based on double orthogonal gratings for real 3D flow fields diagnosis

摘要

Moire tomography is an important technique to diagnose the flow field. However, the traditional moire deflectometry cannot meet the requirements of Volume Moire Tomography (VMT). In this Letter, an improved moire deflected system based on double orthogonal gratings is introduced for real 3-D reconstruction. The proposed method could obtain the first-order partial derivatives in two vertical directions of the projection in one time. Comparing with the traditional moire deflectometry, the proposed system is more effective and easier to realize the multi-direction data acquisition.